docs: def output_cert(gandi, cert, output_keys, justify=13):
      """Helper to output a certificate information."""
      output = list(output_keys)
  
      display_altnames = False
      if 'altnames' in output:
          display_altnames = True
          output.remove('altnames')
  
      display_output = False
      if 'cert' in output:
          display_output = True
          output.remove('cert')
  
      output_generic(gandi, cert, output, justify)
  
      if display_output:
          crt = gandi.certificate.pretty_format_cert(cert)
          if crt:
              output_line(gandi, 'cert', '\n' + crt, justify)
  
      if display_altnames:
          for altname in cert['altnames']:
              output_line(gandi, 'altname', altname, justify)